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16/6/2011
Last night I got some time to work on the MIDI controller
testing. The problem I was left with is that the parameter
knobs were not working, so I started with printing out the
current value for param0 on the LCD and it was always 1023
(the maximum value) no matter what voltage was supplied on
the input pin. So I teared down all the setup code and
checked that I was doing everything right in the software...
which after an hour or so of re-reading all the docs... yes;
I'm doing everything right. Ok that leaves hardware. So I
measured the voltage on the input pin again... yup that's
right too. *sigh* Then I notice there is a "VREF" pot on the
AVR stamp... wonder what that does? Tweak tweak... oooh look
the value on the LCD is finally changing! Seems that VREF
pot on the stamp is controlling something to do with the way
the AVR reads values on it's analog in pins, so I'll have to
write that into the documentation to set correctly when
assembling the kit. So hurrah the parameters are all working
pretty much correctly and I can test the new menu code on
the hardware. I'm getting close to being done with the
testing. All that remains is hooking up the MIDI sockets and
checking the right messages get sent and received.